CN113036726A - Cable-overhead hybrid line intelligence reclosing system based on 5G - Google Patents
Cable-overhead hybrid line intelligence reclosing system based on 5G Download PDFInfo
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- CN113036726A CN113036726A CN202110220571.6A CN202110220571A CN113036726A CN 113036726 A CN113036726 A CN 113036726A CN 202110220571 A CN202110220571 A CN 202110220571A CN 113036726 A CN113036726 A CN 113036726A
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- 238000005259 measurement Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a cable-overhead hybrid line intelligent reclosing system based on 5G. The intelligent 5G self-energy-obtaining current measuring modules are respectively installed on outgoing lines at two ends of a cable, the intelligent 5G self-energy-obtaining current measuring modules are communicated with reclosing locking devices in substations at two sides of the cable through a 5G network and used for transmitting current measured values at two ends of the cable, and the reclosing locking devices remotely monitor state information of the intelligent 5G self-energy-obtaining current measuring modules and modify protection fixed values; the reclosing locking devices in the substations on the two sides construct judgment logics according to currents at the two ends of the cable, whether a fault point is located inside the cable is judged, and if the fault point is judged to be located inside a cable line, reclosing locking signals are sent to related protection devices in the substations on the two sides of the cable-overhead mixed line, so that the function of locking reclosing is achieved, and protection is prevented from being reclosed in the cable fault.
Description
Technical Field
The invention relates to the field of electric power, in particular to a cable-overhead hybrid line intelligent reclosing system based on 5G.
Background
About 90% of short-circuit faults in an electric power system are transient single-phase ground faults. After the relay protection action removes the short-circuit fault, the electric arc is automatically extinguished, and the insulation at the short-circuit point can be automatically recovered under most conditions. The automatic reclosing technology can quickly recover the system power supply after the fault is removed and improve the transient stability level of the power system, and is an important safe automatic control means of the power system.
With the rapid development of an electric power system, submarine cables and urban underground distribution cables are widely put into operation, and a large number of cable-overhead mixed lines exist on site, which brings new challenges to the traditional reclosing technology. Faults occurring on the overhead lines are mostly transient faults. The faults of the cable lines are mainly short-circuit faults caused by defects in manufacturing or insulation reduction caused by use for a period of time, and the faults are permanent faults. If the fault section of the hybrid line is directly reclosed without judgment, a permanent cable fault may be caused to be reclosed, so that the cable is damaged due to impact again, and the safe and stable operation of equipment and a system is influenced.
Therefore, it is necessary to determine the fault section by using an intelligent reclosing technique, and when a fault occurs in an overhead line, the protection device is required to start the circuit breaker reclosing, and when the fault occurs on a cable, the reclosing is locked.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a cable-aerial hybrid line intelligent reclosing system based on 5G, so as to realize the judgment of internal faults of a cable line, and if the faults are judged to be in the cable line, reclosing locking signals are sent to related protection devices in substations on two sides of the cable-aerial hybrid line, so as to realize the function of locking reclosing.
The invention adopts the following technical scheme: the cable-overhead mixed line intelligent reclosing system based on 5G comprises an intelligent 5G self-energy-taking current measuring module and a reclosing locking device, wherein two ends of a cable are respectively connected with an overhead line;
the intelligent 5G self-energy-taking current measuring modules are respectively installed at the outgoing lines at two ends of the cable, and the intelligent 5G self-energy-taking current measuring modules measure the primary current of the cable through a current transformer and realize self energy taking;
the intelligent 5G self-energy-taking current measuring module is communicated with reclosing locking devices in substations on two sides of a cable through a 5G network and used for transmitting current measured values on two ends of the cable, and the reclosing locking devices remotely realize monitoring of state information of the intelligent 5G self-energy-taking current measuring module and modification of protection fixed values; and the reclosing locking devices in the substations on the two sides construct a judgment logic according to the currents at the two ends of the cable, and judge whether the fault point is positioned in the cable.
The intelligent 5G self-energy-taking current measuring module has a self-energy-taking function, and can realize maintenance-free installation on site. The intelligent 5G self-energy-taking current measuring modules are respectively arranged on the outgoing lines at the two ends of the cable, so that the structure of the original primary equipment is not damaged, and the installation is convenient.
Preferably, the reclosing locking device is connected with the 5G network through an optical fiber.
Preferably, if the fault point is located inside the cable, the reclosing locking device opens a "locking reclosing" hard point to a "locking reclosing" opening of the line protection, so that the line protection reclosing is locked during the cable fault.
Preferably, if the cable-overhead hybrid line is a terminal line with only a single-side power supply, the logic for determining whether the fault point is located inside the cable is as follows: if only one side of the current phasor measurement values at the two sides of the cable is larger than the overcurrent fixed value, a fault point is in the cable; otherwise, no cable internal failure occurs.
In the formula (I), the compound is shown in the specification,
and
for current phasors at both sides of the cableMeasured value, Iset1The value is determined for overcurrent.
Preferably, if the cable-overhead hybrid line is a non-terminal line, the logic for determining whether the fault point is located inside the cable is as follows: summing the current phasor measurement values at two sides of the cable, and if the current phasor measurement values are greater than the differential constant value, determining that a fault point is in the cable; otherwise, no cable internal failure occurs.
In the formula (I), the compound is shown in the specification,
and
for measuring current phasors at both sides of the cable, Iset2Is a differential constant.
Preferably, the intelligent 5G self-energy-taking current measuring module comprises a self-energy-taking unit, a 5G communication unit, a measuring unit and a time setting unit, wherein the self-energy-taking unit is connected with an energy-taking mutual inductor, the measuring unit is connected with a measuring mutual inductor, and the energy-taking mutual inductor and the measuring mutual inductor are sleeved at the junction of a cable and an overhead line; the self-energy-taking unit is used for self-taking energy and supplying energy to the whole module; the time synchronization unit realizes the time synchronization of the device through a GPS and a Beidou satellite navigation system; the measuring unit is used for measuring primary current of the cable, and the 5G communication unit is used for communicating with the 5G network and the reclosing locking device.
Preferably, the reclosing locking device acquires the running condition of the intelligent 5G self-energy-taking current measuring module, gives an alarm in time when the intelligent 5G self-energy-taking current measuring module is abnormal, and opens a hard point of the 'closing reclosing' to the opening of the 'closing reclosing' for line protection, so that the closing of the reclosing function is realized.
The invention has the following beneficial effects: according to the invention, the independent differential protection of the cable line is built in the cable, the judgment of the internal fault of the cable line is realized, and if the fault is judged to be in the cable line, the reclosing locking signal is sent to the related protection devices in the transformer substations on two sides of the cable-overhead mixed line, so that the function of locking the reclosing is realized, and the protection is prevented from being reclosed in the cable fault.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a cable-overhead hybrid line intelligent reclosing system in an embodiment of the invention;
fig. 2 is a schematic structural diagram of an intelligent 5G self-energized current measurement module in an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are further described below with reference to the drawings of the specification, but the present invention is not limited to these embodiments.
Fig. 1 shows an intelligent reclosing system for a cable-overhead hybrid line, which includes an intelligent 5G self-energized current measuring module, a reclosing locking device and a communication network related thereto.
The intelligent 5G self-energy-taking current measuring module is used for measuring primary current on two sides of a cable, is respectively installed at outgoing line positions on two sides of the cable on the spot without damaging the structure of original primary equipment and is convenient to install, measures the size of the primary current through a current transformer, has a self-energy-taking function, and can realize maintenance-free after field installation.
The intelligent 5G self-energy-taking current measuring module collects and processes local current information of the cable at the side by utilizing the installed mutual inductor, and realizes communication with reclosing locking devices in substations at two sides through a 5G network to transmit current measured values at two ends of the cable.
The reclosing locking device is connected with a 5G network through optical fibers, and cable differential protection is established according to currents on two sides of a cable, so that whether a fault point is located inside the cable or not is judged. If the fault point is positioned in the cable, a 'locking reclosing' hard contact is switched to a 'locking reclosing' switch-in of the line protection, and the locking of the line protection reclosing is realized during the cable fault.
The reclosing locking device is connected with the intelligent 5G self-energy-taking current measuring module through a 5G network so as to remotely monitor the state information of the intelligent 5G self-energy-taking current measuring module and modify the protection constant value. And the reclosing locking devices in the substations on the two sides construct a judgment logic according to the currents at the two ends of the cable, and judge whether the fault point is positioned in the cable.
If the cable-overhead hybrid line is a terminal line with only a single-side power supply, the logic for judging whether the fault point is positioned in the cable is as follows: if only one side of the current phasor measurement values at the two sides of the cable is larger than the overcurrent fixed value, a fault point is in the cable; otherwise, no cable internal failure occurs.
In the formula (I), the compound is shown in the specification,
and
for measuring current phasors at both sides of the cable, Iset1The value is determined for overcurrent.
If the cable-overhead mixed line is a non-terminal line, the logic for judging whether the fault point is positioned in the cable is as follows: summing the current phasor measurement values at two sides of the cable, and if the current phasor measurement values are greater than the differential constant value, determining that a fault point is in the cable; otherwise, no cable internal failure occurs.
In the formula (I), the compound is shown in the specification,
and
for measuring current phasors at both sides of the cable, Iset2Is a differential constant.
The reclosing locking device can acquire the running condition of the intelligent 5G self-energy-taking current measuring modules on the two sides of the cable, can give an alarm in time when any intelligent 5G self-energy-taking current measuring module is abnormal, and opens a hard point of 'locking reclosing' to the opening of 'locking reclosing' for line protection, so that the locking of the reclosing function is realized.
With reference to fig. 2, the intelligent 5G self-energy-taking current measuring module has a protection level of IP65, is directly installed on a power transmission conductor (i.e., a cable), and has functions of local energy taking, measurement and 5G communication. The intelligent 5G self-energy-taking current measuring module comprises a self-energy-taking unit, a 5G communication unit, a measuring unit and a time setting unit, wherein the self-energy-taking unit is connected with an energy-taking mutual inductor, the measuring unit is connected with a measuring mutual inductor, and the energy-taking mutual inductor and the measuring mutual inductor are sleeved at the junction of a cable and an overhead line. The self-energy-taking unit is used for self-taking energy and supplying energy to the whole module; the time setting unit realizes the time setting of the device through a GPS and a Beidou satellite navigation system, and the time setting error is less than 100 us; the measuring unit is used for measuring primary current of the cable, and the 5G communication unit is used for communicating with the 5G network and the reclosing locking device.
Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The cable-overhead mixed line intelligent reclosing system based on 5G is characterized by comprising an intelligent 5G self-energy-taking current measuring module and a reclosing locking device, wherein two ends of a cable are respectively connected with an overhead line;
the intelligent 5G self-energy-taking current measuring modules are respectively installed at the outgoing lines at two ends of the cable, and the intelligent 5G self-energy-taking current measuring modules measure the primary current of the cable through a current transformer and realize self energy taking;
the intelligent 5G self-energy-taking current measuring module is communicated with reclosing locking devices in substations on two sides of a cable through a 5G network and used for transmitting current measured values on two ends of the cable, and the reclosing locking devices remotely realize monitoring of state information of the intelligent 5G self-energy-taking current measuring module and modification of protection fixed values; and the reclosing locking devices in the substations on the two sides construct a judgment logic according to the currents at the two ends of the cable, and judge whether the fault point is positioned in the cable.
2. The 5G-based cable-overhead hybrid line intelligent reclosing system according to claim 1, wherein the reclosing lock device is connected to a 5G network through an optical fiber.
3. The 5G-based intelligent reclosing system for a cable-overhead hybrid line according to claim 1, wherein if the fault point is located inside the cable, the reclosing locking device opens a "lockout reclosing" hard contact to a "lockout reclosing" open of line protection, thereby achieving lockout of line protection reclosing during a cable fault.
4. The intelligent reclosing system based on 5G cable-overhead hybrid line according to claim 1, wherein if the cable-overhead hybrid line is a terminal line with only one-side power supply, the logic for judging whether the fault point is located inside the cable is as follows: if only one side of the current phasor measurement values at the two sides of the cable is larger than the overcurrent fixed value, a fault point is in the cable; otherwise, no cable internal failure occurs.
5. The intelligent reclosing system based on 5G cable-overhead hybrid line according to claim 1, wherein if the cable-overhead hybrid line is a non-terminal line, the logic for determining whether the fault point is located inside the cable is as follows: summing the current phasor measurement values at two sides of the cable, and if the current phasor measurement values are greater than the differential constant value, determining that a fault point is in the cable; otherwise, no cable internal failure occurs.
6. The intelligent 5G-based cable-overhead hybrid line reclosing system according to claim 1, wherein the intelligent 5G self-energy-taking current measuring module comprises a self-energy-taking unit, a 5G communication unit, a measuring unit and a time-setting unit, the self-energy-taking unit is connected with an energy-taking mutual inductor, the measuring unit is connected with a measuring mutual inductor, and the energy-taking mutual inductor and the measuring mutual inductor are sleeved at the junction of a cable and an overhead line; the self-energy-taking unit is used for self-taking energy and supplying energy to the whole module; the time synchronization unit realizes the time synchronization of the device through a GPS and a Beidou satellite navigation system; the measuring unit is used for measuring primary current of the cable, and the 5G communication unit is used for communicating with the 5G network and the reclosing locking device.
7. The intelligent reclosing system based on the 5G cable-overhead hybrid line according to claim 1, wherein the reclosing locking device obtains the operation condition of the intelligent 5G self-energy-taking current measuring module, gives an alarm in time when the intelligent 5G self-energy-taking current measuring module is abnormal, and opens a hard point of 'closing reclosing' to the opening of 'closing reclosing' for line protection, so as to realize the locking of the reclosing function.
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Cited By (3)
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| CN113346451A (en) * | 2021-06-30 | 2021-09-03 | 西安理工大学 | Reclosing method for self-adaptive fault section of B-type overhead-cable hybrid line |
| CN113991597A (en) * | 2021-09-06 | 2022-01-28 | 绍兴建元电力集团有限公司 | Intelligent reclosing method for overhead line-cable hybrid line |
| CN114079274A (en) * | 2021-09-29 | 2022-02-22 | 华电电力科学研究院有限公司 | Reclosing method of wind power plant current collection circuit based on wireless differential protection |
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| CN114079274A (en) * | 2021-09-29 | 2022-02-22 | 华电电力科学研究院有限公司 | Reclosing method of wind power plant current collection circuit based on wireless differential protection |
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